You can ONLY use the digital OMPT calculator provided during the exam.
If you want to use the calculator, practice with the basic calculator provided in the practice materials. Note that this basic calculator does not apply the order of operations automatically, you have to enter your formula in the right order yourself.
More detailed instructions regarding this calculator can be found on the OMPT platform after registration.
You are NOT allowed to use a physical calculator, calculator on your computer, Google's calculator, or any other external calculator.
You can practice with our online calculator here.